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79 lines
2.5 KiB
Markdown
79 lines
2.5 KiB
Markdown
Title: nix-copy-closure
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# Name
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`nix-copy-closure` - copy a closure to or from a remote machine via SSH
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# Synopsis
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`nix-copy-closure` [`--to` | `--from`] [`--gzip`] [`--include-outputs`] [`--use-substitutes` | `-s`] [`-v`] _user@machine_ _paths_
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# Description
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`nix-copy-closure` gives you an easy and efficient way to exchange
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software between machines. Given one or more Nix store _paths_ on the
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local machine, `nix-copy-closure` computes the closure of those paths
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(i.e. all their dependencies in the Nix store), and copies all paths
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in the closure to the remote machine via the `ssh` (Secure Shell)
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command. With the `--from` option, the direction is reversed: the
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closure of _paths_ on a remote machine is copied to the Nix store on
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the local machine.
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This command is efficient because it only sends the store paths
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that are missing on the target machine.
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Since `nix-copy-closure` calls `ssh`, you may be asked to type in the
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appropriate password or passphrase. In fact, you may be asked _twice_
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because `nix-copy-closure` currently connects twice to the remote
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machine, first to get the set of paths missing on the target machine,
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and second to send the dump of those paths. If this bothers you, use
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`ssh-agent`.
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# Options
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*`--to`*
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: Copy the closure of _paths_ from the local Nix store to the Nix
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store on _machine_. This is the default.
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*`--from`*
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: Copy the closure of _paths_ from the Nix store on _machine_ to the
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local Nix store.
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*`--gzip`*
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: Enable compression of the SSH connection.
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*`--include-outputs`*
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: Also copy the outputs of store derivations included in the closure.
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*`--use-substitutes` / `-s`*
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: Attempt to download missing paths on the target machine using Nix’s
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substitute mechanism. Any paths that cannot be substituted on the
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target are still copied normally from the source. This is useful,
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for instance, if the connection between the source and target
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machine is slow, but the connection between the target machine and
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`nixos.org` (the default binary cache server) is
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fast.
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*`-v`*
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: Show verbose output.
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# Environment variables
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*`NIX_SSHOPTS`*
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: Additional options to be passed to `ssh` on the command
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line.
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# Examples
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Copy Firefox with all its dependencies to a remote machine:
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$ nix-copy-closure --to alice@itchy.labs $(type -tP firefox)
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Copy Subversion from a remote machine and then install it into a user
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environment:
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$ nix-copy-closure --from alice@itchy.labs \
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/nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
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$ nix-env -i /nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
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